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Flippen-Anderson JL, Deschamps JR, George C, Hruby VJ, Misicka A, Lipkowski AW (March 2002). "Crystal structure of biphalin sulfate: a multireceptor opioid peptide". The Journal of Peptide Research. 59 (3): 123–33. doi:10.1034/j.1399-3011.2002.01967.x. PMID11985706.
Lipkowski AW, Misicka A, Davis P, Stropova D, Janders J, Lachwa M, et al. (September 1999). "Biological activity of fragments and analogues of the potent dimeric opioid peptide, biphalin". Bioorganic & Medicinal Chemistry Letters. 9 (18): 2763–6. doi:10.1016/S0960-894X(99)00464-3. PMID10509931.
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Li G, Haq W, Xiang L, Lou BS, Hughes R, De Leon IA, et al. (March 1998). "Modifications of the 4,4'-residues and SAR studies of Biphalin, a highly potent opioid receptor active peptide". Bioorganic & Medicinal Chemistry Letters. 8 (5): 555–60. doi:10.1016/S0960-894X(98)00065-1. PMID9871617.
Mollica A, Davis P, Ma SW, Lai J, Porreca F, Hruby VJ (May 2005). "Synthesis and biological evaluation of new biphalin analogues with non-hydrazine linkers". Bioorganic & Medicinal Chemistry Letters. 15 (10): 2471–5. doi:10.1016/j.bmcl.2005.03.067. PMID15863299.